Not sure about those particular rods but we always taped the ferules prior to a lengthy sessions of spey casting. The mechanics of the cast tends to put a twisting moment into the blank and the ferules can work loose. If you don't notice it at the time, the result can be a broken ferule.

The old greenhart and cane spey rod blanks were cut into sections at an acute angle instead of using ferules. The sections, which matched perfectly, would then be bound together using a leather tape prior to fishing.